I really would like a trowback to the beginnings of DF and highlight some different communitys on Twitch. Some examples
Music streamers: I would suggest a_couple_streams because they have a really unique perspective and also stream as a duo.
Niche communitys: There is a small but vibrant civ multiplayer community, some of those streamers now gain more notariaty with Civ VI out. The community is very interesting because there seems to be a viewership demand that other communitys lack. Streamers with less then 2k followers can get over 100 viewers when none of the bigger streamers are online. As guests i would suggest FilthyRobot, Babayetu_ or Anzleon.
Those are the two communitys i am aware of, but i think there are a lot more out there.